Question

我片段中的代码结构如下：

public class FragmentScanQR extends Fragment {
    ...
    private Button qrFromCameraBtn;
    private View rootView;
    ...

public View onCreateView(final LayoutInflater inflater, final ViewGroup container, Bundle savedInstanceState) {
        rootView = inflater.inflate(R.layout.qrsource, container, false);
        qrFromCameraBtn = (Button)rootView.findViewById(R.id.qrViaCameraBtn);

        qrFromCameraBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                rootView = inflater.inflate(R.layout.fragmenttab1, container, false);
            }
        });

        return rootView;
    }

片段的onCreateView方法返回android.view.View类型的值。 qrFromCameraBtn按钮的onClick方法修改了相同的View变量。在输出中，当我单击按钮时，布局不会更改为R.layout.fragmenttab1（我希望实现），但保持不变。我怎么能这样做？

Answer 1

如果我了解您的需要，您想要用新的片段替换您的第一个片段。你可以这样做：

//Where Article fragment is your new fragment.
ArticleFragment newFragment = new ArticleFragment();
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();

// Replace whatever is in the fragment_container view with this fragment,
// and add the transaction to the back stack so the user can navigate back
transaction.replace(R.id.fragment_container, newFragment);
transaction.addToBackStack(null);

// Commit the transaction
transaction.commit();

来源：https://developer.android.com/training/basics/fragments/fragment-ui.html

Answer 2

如果您只想更换布局，此链接可能会对您有所帮助。 Android - How to dynamically change fragment layout。只需在按钮单击方法

上添加以下代码即可

 qrFromCameraBtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            RelativeLayout rl = (RelativeLayout) findViewById(R.id.about);
rl.removeAllViews();
rl.addView(View.inflate(myView.getContext(), R.layout.about, null));
        }
    });

Button的onClick方法修改Fragment中的全局变量

2 个答案: